2 handle em28xx IR remotes via linux kernel input layer.
4 Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
5 Markus Rechberger <mrechberger@gmail.com>
6 Mauro Carvalho Chehab <mchehab@infradead.org>
7 Sascha Sommer <saschasommer@freenet.de>
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/interrupt.h>
28 #include <linux/input.h>
29 #include <linux/usb.h>
33 #define EM28XX_SNAPSHOT_KEY KEY_CAMERA
34 #define EM28XX_SBUTTON_QUERY_INTERVAL 500
35 #define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20
37 static unsigned int ir_debug;
38 module_param(ir_debug, int, 0644);
39 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
41 #define i2cdprintk(fmt, arg...) \
43 printk(KERN_DEBUG "%s/ir: " fmt, ir->c.name , ## arg); \
46 #define dprintk(fmt, arg...) \
48 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
51 /**********************************************************
52 Polling structure used by em28xx IR's
53 **********************************************************/
55 struct em28xx_ir_poll_result {
56 unsigned int toggle_bit:1;
57 unsigned int read_count:7;
59 u8 rc_data[4]; /* 1 byte on em2860/2880, 4 on em2874 */
64 struct input_dev *input;
65 struct ir_input_state ir;
69 /* poll external decoder */
71 struct work_struct work;
72 struct timer_list timer;
73 unsigned int last_toggle:1;
74 unsigned int last_readcount;
75 unsigned int repeat_interval;
77 int (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);
80 /**********************************************************
81 I2C IR based get keycodes - should be used with ir-kbd-i2c
82 **********************************************************/
84 int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
89 if (1 != i2c_master_recv(&ir->c, &b, 1)) {
90 i2cdprintk("read error\n");
94 /* it seems that 0xFE indicates that a button is still hold
95 down, while 0xff indicates that no button is hold
96 down. 0xfe sequences are sometimes interrupted by 0xFF */
98 i2cdprintk("key %02x\n", b);
112 int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
114 unsigned char buf[2];
118 if (2 != i2c_master_recv(&ir->c, buf, 2))
121 /* Does eliminate repeated parity code */
127 /* Rearranges bits to the right order */
128 code = ((buf[0]&0x01)<<5) | /* 0010 0000 */
129 ((buf[0]&0x02)<<3) | /* 0001 0000 */
130 ((buf[0]&0x04)<<1) | /* 0000 1000 */
131 ((buf[0]&0x08)>>1) | /* 0000 0100 */
132 ((buf[0]&0x10)>>3) | /* 0000 0010 */
133 ((buf[0]&0x20)>>5); /* 0000 0001 */
135 i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n",
144 int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
147 unsigned char buf[3];
151 if (3 != i2c_master_recv(&ir->c, buf, 3)) {
152 i2cdprintk("read error\n");
156 i2cdprintk("key %02x\n", buf[2]&0x3f);
160 *ir_key = buf[2]&0x3f;
161 *ir_raw = buf[2]&0x3f;
166 /**********************************************************
167 Poll based get keycode functions
168 **********************************************************/
170 /* This is for the em2860/em2880 */
171 static int default_polling_getkey(struct em28xx_IR *ir,
172 struct em28xx_ir_poll_result *poll_result)
174 struct em28xx *dev = ir->dev;
176 u8 msg[3] = { 0, 0, 0 };
178 /* Read key toggle, brand, and key code
179 on registers 0x45, 0x46 and 0x47
181 rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
186 /* Infrared toggle (Reg 0x45[7]) */
187 poll_result->toggle_bit = (msg[0] >> 7);
189 /* Infrared read count (Reg 0x45[6:0] */
190 poll_result->read_count = (msg[0] & 0x7f);
192 /* Remote Control Address (Reg 0x46) */
193 poll_result->rc_address = msg[1];
195 /* Remote Control Data (Reg 0x47) */
196 poll_result->rc_data[0] = msg[2];
201 static int em2874_polling_getkey(struct em28xx_IR *ir,
202 struct em28xx_ir_poll_result *poll_result)
204 struct em28xx *dev = ir->dev;
206 u8 msg[5] = { 0, 0, 0, 0, 0 };
208 /* Read key toggle, brand, and key code
211 rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
216 /* Infrared toggle (Reg 0x51[7]) */
217 poll_result->toggle_bit = (msg[0] >> 7);
219 /* Infrared read count (Reg 0x51[6:0] */
220 poll_result->read_count = (msg[0] & 0x7f);
222 /* Remote Control Address (Reg 0x52) */
223 poll_result->rc_address = msg[1];
225 /* Remote Control Data (Reg 0x53-55) */
226 poll_result->rc_data[0] = msg[2];
227 poll_result->rc_data[1] = msg[3];
228 poll_result->rc_data[2] = msg[4];
233 /**********************************************************
234 Polling code for em28xx
235 **********************************************************/
237 static void em28xx_ir_handle_key(struct em28xx_IR *ir)
241 struct em28xx_ir_poll_result poll_result;
243 /* read the registers containing the IR status */
244 result = ir->get_key(ir, &poll_result);
246 dprintk("ir->get_key() failed %d\n", result);
250 dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x\n",
251 poll_result.toggle_bit, poll_result.read_count,
252 ir->last_readcount, poll_result.rc_data[0]);
254 if (ir->dev->chip_id == CHIP_ID_EM2874) {
255 /* The em2874 clears the readcount field every time the
256 register is read. The em2860/2880 datasheet says that it
257 is supposed to clear the readcount, but it doesn't. So with
258 the em2874, we are looking for a non-zero read count as
259 opposed to a readcount that is incrementing */
260 ir->last_readcount = 0;
263 if (poll_result.read_count == 0) {
264 /* The button has not been pressed since the last read */
265 } else if (ir->last_toggle != poll_result.toggle_bit) {
266 /* A button has been pressed */
267 dprintk("button has been pressed\n");
268 ir->last_toggle = poll_result.toggle_bit;
269 ir->repeat_interval = 0;
271 } else if (poll_result.toggle_bit == ir->last_toggle &&
272 poll_result.read_count > 0 &&
273 poll_result.read_count != ir->last_readcount) {
274 /* The button is still being held down */
275 dprintk("button being held down\n");
277 /* Debouncer for first keypress */
278 if (ir->repeat_interval++ > 9) {
279 /* Start repeating after 1 second */
285 dprintk("sending keypress\n");
286 ir_input_keydown(ir->input, &ir->ir, poll_result.rc_data[0],
287 poll_result.rc_data[0]);
288 ir_input_nokey(ir->input, &ir->ir);
291 ir->last_readcount = poll_result.read_count;
295 static void ir_timer(unsigned long data)
297 struct em28xx_IR *ir = (struct em28xx_IR *)data;
299 schedule_work(&ir->work);
302 static void em28xx_ir_work(struct work_struct *work)
304 struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work);
306 em28xx_ir_handle_key(ir);
307 mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
310 static void em28xx_ir_start(struct em28xx_IR *ir)
312 setup_timer(&ir->timer, ir_timer, (unsigned long)ir);
313 INIT_WORK(&ir->work, em28xx_ir_work);
314 schedule_work(&ir->work);
317 static void em28xx_ir_stop(struct em28xx_IR *ir)
319 del_timer_sync(&ir->timer);
320 flush_scheduled_work();
323 int em28xx_ir_init(struct em28xx *dev)
325 struct em28xx_IR *ir;
326 struct input_dev *input_dev;
330 if (dev->board.ir_codes == NULL) {
331 /* No remote control support */
335 ir = kzalloc(sizeof(*ir), GFP_KERNEL);
336 input_dev = input_allocate_device();
337 if (!ir || !input_dev)
340 ir->input = input_dev;
342 /* Setup the proper handler based on the chip */
343 switch (dev->chip_id) {
346 ir->get_key = default_polling_getkey;
349 ir->get_key = em2874_polling_getkey;
350 /* For now we only support RC5, so enable it */
351 ir_config = EM2874_IR_RC5;
352 em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
355 printk("Unrecognized em28xx chip id: IR not supported\n");
359 /* This is how often we ask the chip for IR information */
360 ir->polling = 100; /* ms */
362 /* init input device */
363 snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)",
366 usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
367 strlcat(ir->phys, "/input0", sizeof(ir->phys));
369 ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER, dev->board.ir_codes);
370 input_dev->name = ir->name;
371 input_dev->phys = ir->phys;
372 input_dev->id.bustype = BUS_USB;
373 input_dev->id.version = 1;
374 input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
375 input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
377 input_dev->dev.parent = &dev->udev->dev;
378 /* record handles to ourself */
385 err = input_register_device(ir->input);
394 input_free_device(input_dev);
399 int em28xx_ir_fini(struct em28xx *dev)
401 struct em28xx_IR *ir = dev->ir;
403 /* skip detach on non attached boards */
408 input_unregister_device(ir->input);
416 /**********************************************************
417 Handle Webcam snapshot button
418 **********************************************************/
420 static void em28xx_query_sbutton(struct work_struct *work)
422 /* Poll the register and see if the button is depressed */
424 container_of(work, struct em28xx, sbutton_query_work.work);
427 ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
429 if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
431 /* Button is depressed, clear the register */
432 cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
433 em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
435 /* Not emulate the keypress */
436 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
438 /* Now unpress the key */
439 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
443 /* Schedule next poll */
444 schedule_delayed_work(&dev->sbutton_query_work,
445 msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
448 void em28xx_register_snapshot_button(struct em28xx *dev)
450 struct input_dev *input_dev;
453 em28xx_info("Registering snapshot button...\n");
454 input_dev = input_allocate_device();
456 em28xx_errdev("input_allocate_device failed\n");
460 usb_make_path(dev->udev, dev->snapshot_button_path,
461 sizeof(dev->snapshot_button_path));
462 strlcat(dev->snapshot_button_path, "/sbutton",
463 sizeof(dev->snapshot_button_path));
464 INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);
466 input_dev->name = "em28xx snapshot button";
467 input_dev->phys = dev->snapshot_button_path;
468 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
469 set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
470 input_dev->keycodesize = 0;
471 input_dev->keycodemax = 0;
472 input_dev->id.bustype = BUS_USB;
473 input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
474 input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
475 input_dev->id.version = 1;
476 input_dev->dev.parent = &dev->udev->dev;
478 err = input_register_device(input_dev);
480 em28xx_errdev("input_register_device failed\n");
481 input_free_device(input_dev);
485 dev->sbutton_input_dev = input_dev;
486 schedule_delayed_work(&dev->sbutton_query_work,
487 msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
492 void em28xx_deregister_snapshot_button(struct em28xx *dev)
494 if (dev->sbutton_input_dev != NULL) {
495 em28xx_info("Deregistering snapshot button\n");
496 cancel_rearming_delayed_work(&dev->sbutton_query_work);
497 input_unregister_device(dev->sbutton_input_dev);
498 dev->sbutton_input_dev = NULL;